Well, I personally own this model. I bought it last year (it had remained in stock in Germanos, a Greek electronics chain), as the lockscreen button on my previous phone broke. It has a removable battery indeed -which is great, as I was able to replace it when the initial battery had its battery life suddenly reduced- and I believe also a gyroscope -as I used to have installed there an app on which you drew and then the drawing rotated with the phone. It might be hard for you to find -I have no idea about its availability in Spain- but its well worth examining this option if you find it, as its also cheap -its price for me was 69 euros.

I recommed <span class="bold">Wileyfox Swift</span> that I currently own. It costs around 100 british pounds when its on sale on amazon every month. Its an excellent affordable phone.

What you wanted to know:
- removable battery: yes and you can buy a cheap replacement directly from producer,
- card slot: yes, two
- fm radio: yes, with earphones as antenna,
- dedicated camera button: physical no, digital yes in the menu when screen loads
- no physical buttons besides the ones for power up and volume,
- screen five inches.

You can also go with the newer version called <span class="bold">Spark+</span>
It uses Cyanongen OS 13 that is based on Android 6.0.1 and will definitely be updated to Android 7.0 whenever it gets available.

Just check the specs on the developer site and decide for yourself: http://www.wileyfox.com/

There are no physical buttons as its nowadays standard with smarthphones. Only some expensive rugged phones have physical buttons nowadays. Like this one: http://www.catphones.com/en-gb But you need to shell out some big money for them.

I'm quite happy with the Unnecto Quattro X I got a while back.4.5 inch screen, FM radio, microSD card slot, removable battery, PURE (pretty much) Android 4.4.2 KitKat.

When upgrade time comes around: Unnecto has some updated models, but I'm also considering the new Moto G4 Play. Waiting for reviews on the latter.

There are sites that let you plug in the features you require or require gone, and it gives you all the phones that match that.
For example:

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